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Certificate of Deposit Calculator

Estimate how a certificate of deposit may grow over a fixed term using a deposit amount, rate, and compounding schedule.

Updated April 11, 2026
Free online tool
Planning and research use

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Why this page exists

A CD estimate is easier to compare when the deposit, term, and rate are turned into one clear ending balance. This calculator helps visitors estimate how much a certificate of deposit may grow over a fixed term, how much interest may be earned, and how much of the final balance still comes from original principal alone.

Interactive tool

Run the estimate

Enter your numbers and read the result first, then use the sections below to understand what affects the outcome.

Calculator

Certificate of deposit calculator

Estimate how a certificate of deposit may grow over a fixed term using a deposit amount, interest rate, term, and compounding frequency.

Result

$10,697

Estimated CD ending balance based on the deposit, rate, term, and compounding frequency entered.

Ending balance$10,697

Total interest earned$697

Total principal contributed$10,000

CD term used18 months

$10,000 at 4.50% for 18 months grows to about $10,697 under the compounding assumption entered.
That works out to about $697 in interest beyond the original deposit.
This estimate uses monthly compounding, which can slightly change the result compared with a bank product that compounds on a different schedule.

This is a planning estimate only. Real CD terms, rates, early-withdrawal rules, and compounding details vary by bank and product.

Planning note

Last updated April 11, 2026. Use this tool to compare scenarios and plan ahead, then confirm important details with the lender, employer, insurer, contractor, or other qualified provider involved in the final decision.

How it works

What the calculator is doing

Enter the starting deposit, annual interest rate, term, and term unit.

Choose a compounding frequency if you want to compare how different bank schedules affect the estimate.

The calculator projects the ending balance and separates total interest earned from the original principal.

Understanding your result

The final balance matters, but the interest-earned figure often makes the comparison more useful because it shows what the CD may add beyond the original deposit. This is still only a planning estimate, since real bank terms and penalties can vary.

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Examples

Ways people use this tool

Example scenarios help turn a quick estimate into a more useful comparison or planning step.

Compare a 12-month and 18-month CD

Changing the term helps show how much extra interest a longer fixed deposit may earn under the same rate assumption.

Compare monthly and daily compounding

A compounding toggle can show how different schedules slightly change the estimated ending balance.

Turn a quoted CD rate into a dollar estimate

This is useful when a bank advertises a yield and you want to see the likely dollar result at maturity.

FAQ

Common questions

How is CD growth estimated here?

The calculator applies the interest rate and compounding frequency entered across the CD term to estimate the ending balance.

Why show principal separately from interest earned?

Because it makes the CD result easier to compare by showing how much growth comes from interest beyond the original deposit.

Will this always match a real bank CD exactly?

No. Bank terms, compounding schedules, minimums, and early-withdrawal rules vary, so this result should be treated as a planning estimate only.

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Keep comparing

Use these related tools to compare nearby scenarios, check a second estimate, or keep narrowing down the right decision.

Money ToolsUpdated April 11, 2026